Light Front, Runs and Drives, Airbags Good., , Based on a concept car called the C-XF (C for concept), the 2009 XF is a midsize four-door that will replace the Jaguar S-Type. Dealers are already taking orders for the XF, which goes on sale in March 2008. Competing models, in size and-or price, include the Audi A6, BMW 5 Series, Cadillac STS, Lexus GS sedan and Mercedes-Benz E-Class.